Nickel-Catalyzed Amination of Aryl Chlorides with Amides
作者:Jinpeng Li、Changyu Huang、Daheng Wen、Qingshu Zheng、Bo Tu、Tao Tu
DOI:10.1021/acs.orglett.0c03836
日期:2021.2.5
nickel-catalyzed amination of aryl chlorides with diverse amides via C–N bond cleavage has been realized under mild conditions. A broad substrate scope with excellent functional group tolerance at a low catalyst loading makes the protocol powerful for synthesizing various aromatic amines. The aryl chlorides could selectively couple to the amino fragments rather than the carbonyl moieties of amides. Our protocol
Well-dispersed non-spherical PdNPs with a diameter of 39–45 nm supported on a TiO2–cellulose composite (PdNPs@TiO2–Cell) can be synthesized by a simple and clean route. The catalyst was well characterized by XRD, FE-SEM, EDS, and TEM techniques. The PdNPs have good dispersity on the TiO2–Cell support. This results in excellent catalytic activities for the synthesis of biphenyls, acrylates, acetylenes
可以通过简单干净的方法合成负载在TiO 2-纤维素复合材料(PdNPs @ TiO 2 -Cell)上的直径39-45 nm的分散良好的非球形PdNP。通过XRD,FE-SEM,EDS和TEM技术对催化剂进行了很好的表征。PdNP在TiO 2-电池载体上具有良好的分散性。这导致在较低温度下使用低Pd负载量(1 mol%)合成联苯,丙烯酸酯,乙炔和前手性酮具有出色的催化活性。碱的性质和用量,溶剂的性质,催化剂的用量和反应温度对PdNPs @ TiO 2活性的影响–对细胞进行了彻底的调查。该催化剂显示出至少四倍的可重复使用性,而没有降低催化活性。
Metal-Free Aerobic Oxidative Selective C–C Bond Cleavage in Heteroaryl-Containing Primary and Secondary Alcohols
aerobic oxidativeselective C–C bond-cleavage reaction in primary and secondary heteroaryl alcohols is reported. This reaction was highly efficient and tolerated various heteroaryl alcohols, generating a carboxylic acid derivative and a neutral heteroaromatic compound. Experimental studies combined with density functional theory calculations revealed the mechanism underlying the selective C–C bond
Transition metal complexes of N-heterocyclic carbenes, method of preparation and use in transition metal catalyzed organic transformations
申请人:Organ G. Michael
公开号:US20070073055A1
公开(公告)日:2007-03-29
The present invention relates to catalysts of transition metal complexes of N-heterocyclic carbenes, their methods of preparation and their use in chemical synthesis. The synthesis, ease-of-use, and activity of the compounds of the present invention are substantial improvements over in situ catalyst generation. Further, the transition metal complexes of N-heterocyclic carbenes of the present invention may be used as precatalysts in metal-catalyzed cross-coupling reactions.
Biaryls Made Easy: PEPPSI and the Kumada-Tamao-Corriu Reaction
作者:Michael G. Organ、Mirvat Abdel-Hadi、Stephanie Avola、Niloufar Hadei、Joanna Nasielski、Christopher J. O'Brien、Cory Valente
DOI:10.1002/chem.200601360
日期:2007.1
Initiation) precatalysts 1 and 2 is detailed. The ease-of-use of these catalysts and the synthesis of a wide range of hinderedbiaryls, large coupling partners and drug-like heterocycles, in high yield, makes the PEPPSI-KTC protocol very attractive. The high reactivity of the PEPPSI system allowed a tetra-ortho-substituted heterocycle, 11 to be synthesized at room temperature for the first time using any